Buffer overflow in Cmu Panda3d
CVE-2026-22189
The egg-mkfont utility in Panda3D versions up to and including 1.10.16 contains a stack-based buffer overflow vulnerability due to use of an unbounded sprintf() call with attacker-controlled input. When constructing glyph filenames, egg-mkfont formats a user-supplied glyph pattern (-gp) into a fixed-size stack buffer without length validation. Supplying an excessively long glyph pattern string can overflow the stack buffer, resulting in memory corruption and a deterministic crash. Depending on build configuration and execution environment, the overflow may also be exploitable for arbitrary code execution.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (40.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Cmu Panda3d
- Panda3d — versions 0
Weakness classification (CWE)
References
- seclists.org/fulldisclosure/2026/Jan/10 (Exploit, technical-description, Mailing List, Third Party Advisory, exploit)
- www.panda3d.org/ (Product, product)
- github.com/panda3d/panda3d (Product, product)
- www.vulncheck.com/advisories/panda3d-egg-mkfont-stack-buffer-overflow (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-22189?
- CVE-2026-22189 is a critical-severity vulnerability in Cmu Panda3d, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-01-07.
- How severe is CVE-2026-22189?
- Critical severity. CVSS v3 base score is 9.8 out of 10.